Definitions for tank engine
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Princeton's WordNet
tank engine, tank locomotive(noun)
a locomotive that carries its own fuel and water; no tender is needed
Wiktionary
tank engine(Noun)
a type of steam locomotive train which carries its own fuel and water in the same unit, and so does not pull a tender
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"tank engine." Definitions.net. STANDS4 LLC, 2013. Web. 19 May 2013. <http://www.definitions.net/definition/tank engine>.

